Examine source code of Infogalactic Transporter

{
  "manifest_version": 2,
  "name": "Infogalactic Transporter",
  "description": "This extension allows the user to move between Wiki and IG.",
  "icons": {
    "48": "./images/IW-48.png",
    "128": "./images/IW-128.png"
  },
  "version": "1.3",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Get me outta here!"
  },
  "permissions": [
    "activeTab",
    "storage",
    "tabs",
    "<all_urls>",
    "webRequest",
    "webRequestBlocking"
  ]
}